Method for removing molybdenum from man-made mineral formations
SUBSTANCE: method involves electrochemical and photochemical synthesis of active oxidisers and complexing agents in leaching solution with the production of anolyte and catholyte. Then mineral mass containing molybdenum is successively treated by them thus providing for the transition of molybdenum into liquid phase from which it can be removed by extraction or sorption.
EFFECT: improved efficiency of process due to the reduction of expenditures on reagents and electric power.
2 cl, 1 ex
The invention relates to hydrometallurgy of non-ferrous and noble metals, namely the leaching of molybdenum from technogenic mineral formations, and is intended for industrial extraction of valuable metals.
There is a method of leaching of molybdenum from ores, including crushing, grinding, flotation getting them from the concentrate and the impact in the autoclave under high pressure and at elevated temperature with a solution of soda with getting productive solutions (see Zelikman A.N. Metallurgy of rare metals, metallurgy, 1991, p.41-60).
The disadvantage of this method is inappropriate for its use in the processing of the poor, hard ores and mineral mass formations that caused a significant share of the cost of its implementation.
Closest to the claimed method is leaching of molybdenum from mineral raw materials with electrochemical processing prepared on the basis of the slurry, the liquid phase which contains chloride and sodium carbonate, which, when its circulation through the electrolytic cell is converted in the anode zone in the system is highly active oxidant of sulphur and molybdenum, which provides the transition from the crystal lattice of molybdenite in the liquid phase of the slurry (see US patent No. 3849265 Bernard J. Sheiner at al.)
The efficiency of the data method also is not large enough due to the significant cost of electricity for pumping pulp and synthesis reagents.
The technical result of the proposed invention is to improve the efficiency of the method of extraction of molybdenum from technogenic mineral formations by reducing the unit cost of electricity and chemicals, while ensuring a high level of extraction.
This technical result is achieved in that the method of extraction of molybdenum from technogenic mineral formations, including crushing, grinding and leaching of molybdenum leaching solution, obtained by electrochemical synthesis, containing oxidants, characterized in that the leaching of molybdenum mineral mass produced in two stages, the first stage is obtained by electrochemical synthesis from soda solution in the anode chamber of the electrolyzer anolyte, representing the irradiated UV light water-gas suspension containing in the liquid phase sulfuric and carbonic acid, hydrogen peroxide, hydroxyl radical, and in the gas phase carbon dioxide, atomic and dvuhtomnyy oxygen, ozone, dimeric carboxylic cations
The method is also distinguished by the fact that before entering Catolica it is saturated with oxygen and subjected to UV-irradiation.
Distinctive features of the proposed method is that its leaching of mineral mass produced in two stages: at the first stage of the anolyte representing received in the anode chamber of the cell and irradiated with UV-light water-gas suspension containing in the liquid phase sulfuric and carbonic acid, hydrogen peroxide, hydroxyl radical, and in the gas phase carbon dioxide, atomic and dvuhtomnyy oxygen, ozone, dimeric carbosilane cations
This set of distinctive features improves the efficiency of the method leaching of molybdenum by reducing energy costs and reagents, eliminating the need for circulation of the pulp through the electrochemical cell and increases the proportion of active leaching molybdenum components, synthesized as a result of joint use is education electrochemical and photochemical processes.
The method is as follows.
In an electrochemical membrane reactor was placed a solution of technical soda and apply voltage to the electrodes. At the anode starts to separate carbon dioxide and dvuhtomnyy oxygen, and in the liquid phase, it forms carbonic acid in the cathode chamber is released at the cathode hydrogen, and in the liquid phase is formed more (hydrolytic) alkali. To enhance the yield of oxygen in the anode chamber for 30-60 min after the start of electrolysis add sulfuric acid to achieve pH=3-3 .5 and is exposed anode area source of UV radiation than the active form of the water-gas suspension containing, in addition to coal and sulfuric acid, hydrogen peroxide and hydroxyl radical, and in the gas phase evolved during the electrolysis of carbon dioxide, atomic, singlet dvuhtomnyy oxygen, ozone and dimeric carboxylic cations
At the same time, clustering and partial oxidation of sulfur active oxygen, with the formation of sulfates, which provides in General the preparation of the following layers of the mineral matrix to the leaching of molybdenum.
After treatment with anolyte carry out the addition to the water-mineral mixture Catolica and, accordingly, doselectone molybdenum active sodium carbonate formed by the reaction of carbonic acid with sodium hydroxide (as a part of Catolica). Previously, to compensate for the loss of active oxygen in the anolyte, catholyte is saturated with oxygen and irradiated with UV light. The treatment of the mineral mass of the mixture of the analyte and Catolica, developed on the contact surface of the particles of molybdenite actively flows through the reaction of molybdenum with sodium carbonate and active oxygen:
This ensures a high level of extraction of molybdenum at a relatively low cost of electricity and chemicals.
An example of a specific use of the method.
Stale tailings ores Shakhtinsk the th field, which is uncovered in the molybdenum concentrate mainly composed pereselenskogo in the process of pretreatment of molybdenite.
Preparing active 1.0%soda solution by bubbling air for oxygen saturation in the diaphragm electrochemical electrolysis reactor for 1 hour, after that, to enhance the yield of oxygen in the anode chamber was added sulfuric acid to achieve pH=3 and irradiated anode zone of the UV light in the range of 180-300 nm lamps CES-230 30 min Obtained active water-gas suspension used to prepare the slurry on the basis of tailings W:T=1:3, kept her in a cell for 3 days, after which was added to the slurry catholyte, optionally enriched with oxygen and passed UV-irradiation. The catholyte was injected into the slurry to achieve pH=8.5 in W:T=1:1.2 and barbotirovany it for 2 hours, after which he entered the ion exchange resin selective for molybdenum and continued sparging for 3 hours. Then saturated resin was separated on a sieve.
Extraction of molybdenum on the resin was 75%of that for the processing of tailings is quite high.
1. The method of extraction of molybdenum from technogenic mineral formations, including crushing, grinding and leaching of molybdenum leaching solution,obtained by electrochemical synthesis, containing oxidizing agents, characterized in that the leaching of molybdenum mineral mass produced in two stages, the first stage is obtained by electrochemical synthesis from soda solution in the anode chamber of the electrolyzer anolyte, representing the irradiated UV light water-gas suspension containing in the liquid phase sulfuric and carbonic acid, hydrogen peroxide, hydroxyl radical, and in the gas phase carbon dioxide, atomic and dvuhtomnyy oxygen, ozone, dimeric carboxylic cations (C2About4+), and at the second stage - Catolica representing received in a cathode chamber of the electrolytic cell soda-alkaline solution containing carbonate, bicarbonate and sodium hydroxide.
2. The method according to claim 1, characterized in that before leaching Catolica it is saturated with oxygen and subjected to UV-irradiation.
SUBSTANCE: method includes magnetic-gravitational treatment of red mud. The starting red mud first undergoes dispergation in the presence of sodium hexametaphosphate in a rotary-pulsation apparatus, followed by low-gradient wet magnetic separation in a field with strength of 0.1-0.15 T to obtain a magnetite and a bulk concentrate, subjecting the bulk concentrate to high-gradient magnetic separation in two steps in a field with a strength of not less than 1.2 T to extract magnetic and nonmagnetic fractions, subjecting the magnetic fraction to gravitational concentration on a concentration table to obtain a hematite concentrate and tailings, combining the nonmagnetic fraction with the tailings from gravitational concentration and performing two-step selective flocculation in the presence of a flocculant to separate a component which primarily consists of aluminium and silicon oxides from an iron-containing product, which is concentrated by high-gradient magnetic separation with field strength of 0.5-0.7 T to obtain an additional iron-containing product, which is combined with the hematite concentrate to obtain an iron-containing concentrate, and residual aluminosilicates which are combined with the component primarily consisting of aluminium and silicon oxides to obtain an aluminosilicate product.
EFFECT: high degree of extraction of iron into an iron-containing product and obtaining an aluminosilicate product with high iron content.
SUBSTANCE: solid copper-vanadium wastes are leached with water to obtain copper-vanadium pulp, to which is added calcium hypochloride or clarified pulp from gas treatment facilities from titanium-magnesium production with concentration of active chlorine equal to 15-90 g/dm3, with ratio of calcium hypochlorite to the copper-vanadium pulp of (1.5-2.0):1. The pulp is held while stirring for 2-5 hours. Hydrochloric acid is added while stirring until achieving solution pH of 2.0-3.0. The suspension is filtered and the copper (II) solution is fed into a cementing apparatus. The precipitate in the form of a mixture of a reducing agent and copper powder is separated into copper powder and a reducing agent. The copper powder is washed, filtered and dried and iron impurities are removed by magnetic separation. After decantation, the reducing agent is returned to the cementing step.
EFFECT: high copper extraction and improved processing properties of the obtained copper powder.
10 cl, 3 ex
SUBSTANCE: invention relates to extraction of metals from flow rich in hydrocarbons and carbon residues with the help of treatment section. Proposed method comprises feeding of said flow to extraction by its mixing with appropriate hydrophilising agent to kill hydrophobic properties of said flow. Mix of said flow and said agent are fed so separation of liquid phase containing major portion of hydrophilising agent and hydrocarbons precipitated from solid phase. Separated solid phase is dried at 350°C to remove medium-light hydrocarbon components. Separated solid phase, preferably dried, is fed for leaching by alkaline solution in the presence of air and/or oxygen, possibly, in the presence of emulsifier or its precursor. Then, leached mix is fed for separation to remove solid residue from leach liquor.
EFFECT: higher yield of valuable metals and hydrocarbons.
13 cl, 3 dwg, 1 tbl, 8 ex
SUBSTANCE: method includes oxidising roasting, percolation leaching of the roasted product with aqueous solution of an oxidising agent or mixtures of oxidising agents to obtain a rhenium-containing solution and an insoluble residue, sorption of rhenium from the rhenium-containing solution in a separate apparatus, drying the insoluble residue, mixing with fluxing agents and fusion on a metal collector. Percolation leaching is carried out at redox potential values of 900-1100 mV and temperature of 50-90°C, with simultaneous sorption of rhenium, followed by desorption and separation of rhenium compounds or rhenium metal from the strippant. The fluxing agents used to fuse the insoluble residue are fluorspar, sodium carbonate and sodium nitrate. Fusion is carried out at temperature of 1200-1800°C on a metal collector in several steps, while discharging the formed slag after each step and fusing the next portion of the mixture on the collector from the previous fusion with separation of the alloy of platinum metals with the collector.
EFFECT: high degree of extraction of rhenium, low reactant consumption, labour input, faster processing of the material, considerable reduction of the volume of solutions which require recycling.
8 cl, 1 dwg, 1 ex
SUBSTANCE: device contains successively installed a feed hopper, an open hearth furnace, an afterburning chamber, a recuperator of combustion air heating, a heat recovery unit, a smoke exhauster and a smokestack, means for fuel supply. The furnace is provided with a bag filter for purification of flue gases from dust and a catalytic apparatus for purification of flue gases from carbon oxides and nitrogen oxides. The catalytic apparatus consists of a vertical case with a conic bottom, inside which from top to bottom placed are: a vertical heat-exchanger, a liquid distributer, an absorption section, a desorption-cooling section, an aspiration hood with a fan and a Venturi tube. A method includes preparation of a charge in the form of a mixture of wastes with flux, loading of the charge and its melting in a bath of the open hearth furnace at a temperature of 1450-1500°C. Performed are: discharge of released combustible components into the afterburning chamber with heat recovery of flue gases, purification of flue gases from dust in the bag filter, purification of smoke gases from carbon oxides and nitrogen oxides is performed in the catalytic apparatus.
EFFECT: method improvement.
2 cl, 2 dwg
SUBSTANCE: group of inventions relates to utilisation of solid mercury-containing wastes, in particular fluorescent lamps. A method of utilisation of solid mercury-containing wastes includes an oxidation stage with further stand, processing a wastes mixture with a demercurised solution of an alkali metal polysulfide with further stand of the reaction mixture. Wastes are divided into two parts. One part, which contains crushed wastes, is processed with an oxidant, and then with a demercurised iodine-alcohol solution or a sodium sulfide solution. The second part of wastes in the form of aeromixture is passed through a nanoporous carbon sorbent NCMS-J. A device for utilisation of mercury-containing wastes contains a unit of loading and crushing, a purification unit and an aeromixture unit. The purification unit is made in the form of a truncated cone, connected by means of a flange to a cylindrical reservoir with a perforated screw, provided with a valve for the solution discharge, and an upper part of the perforated screw is provided with an unloading flange for discharge into a storage hopper. The aeromixture unit is made in the form of a column type adsorber with the nanoporous carbon sorbent NCMS-J.
EFFECT: ensuring reduction of mercury vapour concentration in air and water extract to TLV level, neutralisation of solid wastes of compact fluorescent lamps to IV class of hazard.
7 cl, 1 dwg, 4 ex
SUBSTANCE: furnace includes a housing formed with refractory external side, front and rear end walls, two baths restricted with bottoms, an arch and walls, two drain tap holes, a gas duct and a pedestal, on which all parts are arranged. In the furnace there is external heat insulation of walls, which consists of asbestos tailings and a double layer of asbestos boards. The furnace pedestal has two layers made of light-weight brick with the double layer of asbestos boards between them, a quartz sand layer from below and from above, which is mixed with asbestos tailings, and three layers of asbestos boards on the top, on which bottom block are laid. A casting shoe includes a housing formed with refractory external side, front and rear end walls, a bath, restricted with a bottom, an arch and walls, and drain tap holes. The casting shoe pedestal has two layers made of light-weight brick and separated with an asbestos board layer, and a lower asbestos board layer. The casting shoe has two tap holes made in quick-changeable tap-hole bricks in a box. The furnace has two turning chutes with a turning bowl, which are installed on brackets welded to the casting shoe box, which are turned during liquid metal pouring process for subsequent pouring of molten metal in the furnace to pouring equipment located in a maintenance sector with an angle of 143°. Five injection burners are installed in the furnace and the casting shoe. The furnace operates at natural and artificial draft with a dust and gas cleaning system.
EFFECT: improving efficiency and decreasing heat losses.
5 cl, 12 dwg
SUBSTANCE: electronic waste is crushed on a hammer crusher; crushed copper is added, and then, it is fused in presence of flux during 45-60 minutes at the temperature of 1320-1350°C with air blowdown at its flow rate of 3-4.5 l/h and the obtained slag containing at least 2.6 wt % of precious metals is separated from slag.
EFFECT: effective electronic waste processing with increase of content of precious metals in an alloy.
SUBSTANCE: mixture, consisting of sulphur powder, granules of floatation sulphur pyrite of grade KSF-4 in mixture with broken stone with fraction 20-70 mm or brick crumbs, which are simultaneously agent binding mercury in ionised and neutral forms, taken in ratio 1:9 by weight, and water. After that, mixture is homogenised at rotation rate 20 rev/min, argon is supplied at rate 5.5-6.5 m3/h and then mercury-containing wastes are charged in amount which is at least 50 times less than weight of sulphur powder. Grinding of wastes is carried out to complete binding of metal mercury into water-insoluble compound HgS.
EFFECT: simplification of technology, increase of ecological safety of the process.
SUBSTANCE: method includes combined grinding of wastes with sulphur powder and crushing medium in rotary reactor for binding metal mercury into water-insoluble compound. As crushing medium used is sulphur pyrate with fraction 50-150 mm, which is simultaneously agent, binding mercury in ionised and neutral forms. Before combined grinding mixture of sulphur powder, sulphur pyrate and water is preliminarily homogenised, and reactor is filled with nitrogen, supplied at rate 7.5-8.5 m3/h, in amount which is at least 50 times less than weight of sulphur powder. After that mercury-containing wastes are charged and grinding is carried out to complete binding of metal mercury into water-insoluble compound HgS.
EFFECT: simplification of technology and increase of processing process safety.
FIELD: process engineering.
SUBSTANCE: invention relates to production of Mo-99. Proposed device comprises solution reactor fitted in the circuit of circulation of fuel solution based on uranyl salt, fuel solution pump to force fuel solution from the reactor, heat exchanger, at least one sorption column to absorb Mo-99 from fuel solution. Besides it includes nuclear-safe apparatus for curing of fuel solution arranged above the reactor and at least one sorption column. Said column consists of two intercommunicating vessels. Note here that first communicating vessel has branch pipes of pressure and overflow pipelines connecting curing apparatus with reactor. Second communicating vessel has drain pipeline branch pipe arranged under overflow pipeline branch pipe. Said vessel communicates curing apparatus with solution reactor via at least one sorption column. This device is equipped with pump to force fuel solution into rector circuit of circulation of fuel solution between said curing apparatus and at least one sorption column.
EFFECT: higher efficiency.
5 cl, 1 dwg
SUBSTANCE: method for integrated treatment of tailings of floatation beneficiation of molybdenum-tungsten ore involves preliminary separation of a mineral fraction with relatively high average content of molybdenum and tungsten according to physical properties. That fraction is subjected to thermal or thermochemical treatment, which provides thermal dissociation and sublimation of said metals in form of volatile compounds - oxides, e.g., tungsten and molybdenum trioxides, followed by deposition at different temperature in an oxidative, neutral or reducing atmosphere, which enable to separate molybdenum and tungsten on a reaction substrate, e.g., on calcite, to form artificial calcium tungstate or molybdate, respectively.
EFFECT: recovery of molybdenum, tungsten and other metals from tailings of floatation beneficiation of molybdenum-tungsten ores.
2 cl, 4 dwg, 6 tbl
SUBSTANCE: method for removing molybdenum from tungsten-containing solutions is performed by means of a complexing method by introduction to the solution of water-soluble polyelectrolyte of cationic type at the weight ratio of molybdenum : polyelectrolyte, which is equal to 2:1-2:3, and by passing through a semi-permeable membrane of the formed solution having pH value of 10-12 so that tungsten-containing filtrate is obtained, in which molybdenum-to-tungsten ratio is less than 5 wt %.
EFFECT: improved ultrafiltration properties, high cleaning of molybdenum from tungsten, improved technical and economic indices of membrane separation of molybdenum and tungsten in water solutions.
SUBSTANCE: extraction of molybdenum and cerium is carried out in two steps, where molybdenum is extracted at the first step and a cerium compound is extracted at the second step. The first step involves crushing a catalyst, adding a solution of a leaching agent in weight ratio to the spent catalyst of (0.5-10):1, in concentration of not less than 0.1 mol/l, stirring the suspension for 4-10 hours at temperature of 90-95°C, filtering the mixture to separate the residue and washing the residue with water. A mixture is then prepared from the filtrate and water from washing the residue containing molybdenum. The mixture is the evaporated to obtain an end product. The second step of extracting the cerium compound is then carried out, where the residue of the crushed catalyst is completely dissolved in hydrochloric acid, water is added and then evaporated to the initial volume of the solution, the undissolved portion is separated by filtering, the remaining solution is neutralised to pH 3.5-4.5 with control thereof, the solution is heated to 90-100°C while stirring, followed by successively adding a calcium salt solution in ratio of calcium to the catalyst from 1:100 to 5:100 and a saturated oxalic acid solution in ratio to the catalyst from 5:1 to 10:1, stirring at temperature of 70-100°C for 2-6 hours, holding the solution to precipitate the cerium compound for 4-24 hours at room temperature, separating the precipitate from the mother solution by filtering, washing and drying to constant mass. The invention also discloses a method of extracting molybdenum only from said catalyst and a method of extracting cerium only from said catalyst.
EFFECT: extracting molybdenum and cerium with high percentage output and purity by preventing the effect of the extracted components on each other.
19 cl, 2 tbl, 18 ex
SUBSTANCE: method of recovering molybdate or tungstate from an aqueous solution, in which molybdate or tungstate is bound from the aqueous solution at pH in the range from 2 to 6 with a water-soluble, cationised inorganic carrier. The saturated carrier is separated and the bound molybdate or tungstate is released once again into aqueous solution at a pH in the range from 6 to 14. The cationised inorganic carrier is bentonite, hectorite or attapulgite which is subjected to ion exchange with tetraalkylammonium ions or quaternised esters of fatty acids and alkanolamines.
EFFECT: simple method with high recovery of molybdate or tungstate from solutions.
19 cl, 2 tbl, 10 ex
SUBSTANCE: processing method of molybdenite concentrates includes concentrate chlorination at temperature not more than 450°C, collection of molybdenum dioxychloride in condenser and its conversion to ammonium paramolybdat. At that alcali metal chlorides are used as chlorinating agent. Chlorination is performed with atmospheric oxygen available forming solid residue which is leached by alkali liquor with molybdenum being converted to solution. Ammonium paramolybdat and molybdenum trioxide are obtained from the solution. When potassium chloride is used as chlorinating agent, potassium sulphate - potassium fertiliser is extracted from leaching solution.
EFFECT: simplifying process and creation of environmentally safe technology for processing of molibdenite concentrates excluding risk of formation and emission of sulphur dioxide to atmosphere.
2 cl, 2 ex
SUBSTANCE: method includes sorption of rich components from production solutions by ion-exchange material counterflow under controlled pH of environment and oxidation-reduction potential Eh. Sorption is performed by ion-exchange materials in stages from production solutions containing uranium, molybdenum, vanadium and rare earth elements. At the first stage uranium and molybdenum are extracted by anion-exchange material sorption. At the second stage vanadium is extracted by anion-exchange material sorption with hydrogen dioxide available at Eh of 750-800 mV, pH of 1.8-2.0 and temperature of 60°C, at that vanadium sorption is performed till complete destruction of hydrogen dioxide and till Eh is below 400 mV. Then barren solutions are transferred to cationite at pH of 2.0-2.5 and Eh of 300-350 mV for extraction of rare earth elements.
EFFECT: sorption concentration and selective separation of uranium and molybdenum from vanadium, and vanadium from rare earth elements, and rare earth elements from iron and aluminium, intensification of sorption process, reduction of flow diagram and possibility of environmentally sound oxidants use.
1 dwg, 4 tbl, 1 ex
SUBSTANCE: processing method of black-shale ores with rare metals extracting includes leaching of ore by sulphuric acid solution with dilution of rare metals. Leaching is performed in autoclave by sulphuric acid solution consisting of free and combined sulphuric acid with ratio of H2SO4(free):H2SO4(comb)=2:1, and containing 25-45 g/l of iron sulphate, 70-90 g/l of aluminium sulphate and 0.5 g/l of nitric acid. At that the process is performed under pressure in autoclave equal to 10-15 atm with mixing at temperature of 140-160°C in concentration range of general H2SO4(gen) equal to 350-450 g/l under pulp density S: L=1:0.7-0.9, preferably 1:0.8, under constant oxidation-reduction potential Eh in the system equal to 350-450 mV during 2-3 hours till residual concentration of free H2SO4(free) is within 45-75 g/l.
EFFECT: increasing break-down of ore and extraction of rare metals: vanadium, uranium, molybdenum and rare-earth elements, reducing consumption of acid and improving efficiency of autoclave volume usage.
1 tbl, 1 ex
SUBSTANCE: invention can be used for extraction, concentration and cleaning of molybdenum from companion elements (Fe3+, Cu2+, Zn2+, Ni2+, Co2+, Al3+, Sn4+, Sb3+, rare-earth elements3+, etc.) at processing of different liquid and solid molybdenum-containing wastes and middling products. Extraction method of molybdenum from diluted acid solutions containing companion elements of molybdenum involves molybdenum deposition in the form of its salt. Besides, deposition with molybdenum purification is performed in the form of its cesium salt of 12-molybdophosphoric acid containing the following: Cs3-xHxPMo12O40·nH2O (x=0-1, n=9-12). Deposition is performed at heating up to 40-80°C by subsequent addition of orthophosphate-ion in the form of soluble phosphate or orthophosphoric acid, strong acid, for example sulphuric acid or sodium hydroxide up to pH 1-3 and soluble cesium salt, including mother solutions obtained during leaching of pollucite.
EFFECT: increasing extraction degree of molybdenum from process and effluent solutions.
2 dwg, 3 ex
SUBSTANCE: method involves two-stage processing of concentrates with water solution of nitric acid, pulp filtration so that cake and molybdenum-containing solution is obtained. Then, calcium molybdate suitable for making of ferromolybdenum is deposited from the solution. Decomposition of concentrates is performed at addition to water solution of nitric acid, sulphuric acid in the quantity sufficient for retention of the whole molybdenum in the solution in composition of water-soluble sulphate compounds of molybdenyl, and namely with anionic complex [MoO2(SO4)2]2-.
EFFECT: creation of economic and environmentally safe technology allowing to process low-grade molybdenite concentrates as per a short scheme, which provides sufficient increase in throughout extraction of molybdenum and its associated metals from ores to commodity products, and thus, contributes to more rational use of mineral resources.
2 cl, 3 tbl, 2 ex
SUBSTANCE: invention relates to hydrometallurgy of noble metals. Proposed process comprises grinding of stock to not over 90%-grade minus 10 mcm, pressure leaching at oxygen feed at 100-110°C and partial pressure of oxygen of 1.0-1.5 MPa with production the pulp. Then, pulp is divided into solution and solid residue. Precious metals are extracted from solid residue of pressure leaching by solution containing artificially produced thiosulphate ions by processing of pressure oxidation residue including elementary sulphur by solutions containing sulphite-ion. Note here that concentration of sulphite-ions in solution fed for leaching makes 30-65 g/l. To accelerate dissolution of precious metals leaching is performed at pulp temperature of 20-80°C and medium pH of 5.5-40.5.
EFFECT: lower costs, higher yield.
10 cl, 4 tbl, 2 ex